Determination of Cerium-144 in Vegetation and Soil. Hasl-143.

An extraction method has been used to determine cerium144 in vegetation and soil. The principle advantages of the method are, (1) equilibration of cerium carrier and activity in the initial step of the procedure, (2) provision for the determination of strontium-90 and cesium-137 in vegetation and strontium-90 and normal cerium in soil. The results of measurements on fourteen wheat samples col lected from sites in the United States during 1962 are reported, Data for replicate analyses of two soil types and duplicate and single analyses for a small varied group of soils collected in 1960 are listed.